Drainage element
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United States of America Patent
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Apr 26, 2011
Grant Date -
May 6, 2010
app pub date -
Feb 5, 2009
filing date -
Nov 3, 2008
priority date (Note) -
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Abstract
A preassembled drainage line element is fabricated at least in part of a biodegradable material, such as kraft paper or a plastic film. The biodegradable material may be perforated to impart a characteristic of water permeability to the material.
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